A pure Go package for coordinate transformations.

Last update: Nov 25, 2022

Comments: 1

WGS84

A pure Go package for coordinate transformations.

go get github.com/wroge/wgs84

Usage

east, north, h := wgs84.LonLat().To(wgs84.ETRS89UTM(32)).Round(2)(9, 52, 0)
// 500000 5.76103821e+06 0

east, north, h := wgs84.To(wgs84.WebMercator())(9, 52, 0)
// 1.0018754171394621e+06 6.800125454397305e+06 -9.313225746154785e-10

epsg := wgs84.EPSG()

lon, lat, h := wgs84.ETRS89UTM(32).To(epsg.Code(4326)).Round(3)(500150, 5761200, 0)
// 9.002 52.001 0

// EPSG-Codes covering the coordinate {longitude: 9, latitude: 52}:
codes := epsg.CodesCover(9, 52)
// [25832 4314 32632 4978 4258 31467 4326 3857 900913]

...Calculate EPSG-Code from Unknown Coordinates
...Calculate WebMercator Tile from WGS84 Longitude Latitude
...Transformation between OSGB36 NationalGrid and WGS84 Geographic Coordinates
...Adding a CoordinateReferenceSystem (MGI AustriaLambert) to the EPSG-Repository

Features

Helmert Transformation
Web Mercator
Lambert Conformal Conic
Transverse Mercator (UTM)
EPSG-Code Coverage
...
Easily expandable through simple Interfaces

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Comments

transform result accuracy

Here's my code

type spheroid struct {
	a, fi float64
}

func (s spheroid) A() float64 {
	return s.a
}

func (s spheroid) Fi() float64 {
	return s.fi
}

func main() {
	test := wgs84.Datum{
		Spheroid: spheroid{
			a:  6378137,
			fi: 298.257222101,
		},
		Area: wgs84.AreaFunc(func(lon, lat float64) bool {
			if lon < 118.5 || lon > 121.5 || lat < 24.43 || lat > 53.33 {
				return false
			}
			return true
		}),
	}

	proj := test.TransverseMercator(120, 0, 1, 500000, 0)

	epsg := wgs84.EPSG()
	epsg.Add(4549, proj)

	transform := wgs84.Transform(epsg.Code(4549), wgs84.LonLat())
	f1, f2, f3 := transform(478077, 4025869, 0)
	fmt.Println(f1, f2, f3)

}

wkt for epsg:4549

PROJCS["CGCS2000 / 3-degree Gauss-Kruger CM 120E",
    GEOGCS["China Geodetic Coordinate System 2000",
        DATUM["China_2000",
            SPHEROID["CGCS2000",6378137,298.257222101,
                AUTHORITY["EPSG","1024"]],
            AUTHORITY["EPSG","1043"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4490"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",120],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",500000],
    PARAMETER["false_northing",0],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AUTHORITY["EPSG","4549"]]

With my code I got result is [119.75572865201768, 36.36317346481494, -3.6767683923244476e-05] But What I got form epsg.io was [119.7557287, 36.3631738], and from gdaltransform was [119.755728654111, 36.3631737608256, 0]

So I am wandering what makes these differences? Is there any problems?

A pure Go package for coordinate transformations.

WGS84

Usage

Features

Owner

Malte Wrogemann

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Comments

transform result accuracy

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